extremist ties, but the case on him was closed. >> alisyn: joining usisjonathanguilliams,a former fbi special agent with joint terrorism task force as well as a retired navy seal and formal federal air marshall. you have done it all jonathan. >> i get bored easy. >> alisyn: you were talking to us while we were talking to molly that you think there could have been mistakes made at the finish line at the boston marathon they could have secured it better? >> sure. you typically see in any special event in some events like a marathon, the beginning you will have in the case of the marathon you have like 70,000 people there. but at the very end, you are going to have all those people congregating, you will have the families there and so typically the end of a event whether it's a yankee game or marathon is a very, very critical time. and it's a critical area. so you have to look at what the vulnerabilities are to that critical area. and you would typically freeze that zone. >> alisyn: when you say freeze, you mean not allow backpacks to get into that square block radius? >> what good does